fungus

US /ˈfʌŋ.ɡəs/
UK /ˈfʌŋ.ɡəs/
"fungus" picture
1.

any of a group of spore-producing organisms feeding on organic matter, including molds, yeast, mushrooms, and toadstools

:
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Mushrooms are a type of fungus.
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The damp conditions encouraged the growth of fungus on the walls.
:
moldyeastmushroom